If you have used email for any length of time, you have likely been subjected to spamunwanted email sent to thousands of people at the same time. Ubuntu provides an MDA named Spamassassin to assist you in reducing and eliminating unwanted emails. Easily integrated with Procmail and Sendmail, it can be configured for both systemwide and individual use. It uses a combination of rulesets and blacklists (Internet domains known to mail spam).
Enabling Spamassassin is simple. You must first have installed and configured Procmail. The readme file found in /usr/share/doc/spamassasin provides details on configuring the .procmail file to process mail through Spamassassin. It will tag probable spam with a unique header; you can then have Procmail filter the mail in any manner you choose. One interesting use of Spamassasin is to use it to tag email received at special email accounts established solely for the purpose of attracting spam. This information is then shared with the Spamassassin site where these "spam trap" generated hits help the authors fine-tune the rulesets.
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